50 AUSTRALIAN L VXD SHELLS. 



colours. Iii this lie is mistaken the coloration lie gives agrees very 

 well with that of an extensive series of specimens in nvv possession of 

 the next species ; hut not one of those coloured ones has the outer 

 lip more than very faintly thickened and reflected, as stated by Angas, 

 Pro. Zool. Soc, 1863, p. 520, to bo the case with his nor have any 

 of those, upwards of 100 in number, collected lately by Mr. Masters. 

 "While not desirous to add to the number of doubtful species, I can- 

 not admit that the thin, brightly banded, conspicuously striately 

 ribbed specimens to be next described, as specifically identical with 

 this massive, smooth, porcellaneous, granular, white shell already dis- 

 tinguished, and I therefore make it a new species. Pfeiffer's original is 

 stated by him to be from the neighbourhood of Lake Torrens, in 

 29 S. latitude. Angas gives " under salt bushes, on the plains at 

 Arrowie, near Lake Torrens." 



127. Helix bitseniata. Cox. Plate IV. Pig. 9. M.C. 

 H. Angasiana, not of Pfeiffer. Crosse, Journ. de Conchyl., 1863, 



p. 275. 

 Angas, Pro. Zool. Soc, 1863, p. 520. 



Shell perforated, glob ularly- conical, thin, translucent, slightly glossy, 

 rather strongly rugosely and somewhat plicately striated, more so at 

 the suture, horny-reddish-yellow, sometimes tinged with green, with 

 two spiral bands of purplish-chestnut on each whorl, one under the 

 suture, the other along the middle ; spire obtusely-conical ; whorls 

 5, convex, last inflated, not descending in front ; base convex, pale 

 yellowish-horny, umbilicus small, -i covered; aperture ovately-lunar ; 

 peristome straight, very slightly thickened and expanded, right 

 and outer border regularly curved, columellar margin forming a 

 blunt angle, and then slanting upwards, dilated and reflected, very 

 moderately callous, white or pinkish, as is also in the interior of the 

 mouth. 



Diameter, greatest - 70 ; least - 65 ; height - 50 of an inch. 



Habitat. Port Augusta, South AustraHa. Masters. 



Enough has already been stated regarding the specific distinctness of 

 this shell and H. Angasiana. The name indicates the chief, perhaps 

 the only, character by which it may readily be known from H. 

 leptogramma, and yet occasionally the bands are nearly obsolete. 



128. Helix Cassandra. Pfr. 

 Pfr., Pro. Zool. Soc, 1863, p. 527. 



Shell moderately umbilicated, globosely-depressed, thin, finely striated, 

 and very minutely granulated, hardly shining, above pale broAvnish- 

 yellow, obsoletely marked with some deeper bands, beneath 

 whitish; spire shortly conically- elevated, with a minute vertex; whorls 

 5, regularly increasing, the uppermost scarcely at all convex, last 

 inflated, scarcely deflected in front ; aperture roundly-lunate, some- 

 what pearly within ; peristome simple, thin, right margin straight, 

 basal slightly reflected, dilated at the umbilicus into a vaulted 

 triangular plate. 



Diameter, greatest T02 ; least 0'86 ; height 0'59 of an inch. 



